Actually I think that if differences in group (sex, race, ethnicity, class, caste) intelligence (IQ) means and distributions proved to be of genetic origins this would be a net gain in utility since it would increase public acceptance of genetic engineering and spending on gene based therapies.

BTW We already know that the differences are real as in they are measured and we have tried our very best to get rid of say cultural bias, and proving that they aren't culturally biased is impossible so its deceiving to talk "if differences proved to be real" as some posters have done, its more accurate to say "if differences proved to be mostly genetic in origin".

Which reminds me, we also know that some of the differences are caused by environmental factors, the so called hereditarnian (known as nature or genetic) position is actually dominated by a model that ascribes about equal weight to environment and genetics. And even experts who are generally labelled as "nurture" supporters like say the respected James Flynn have said that they aren't ruling out a small genetic component.